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What is the main raw material in the manufacture of polyurethane?

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What is the main raw material in the manufacture of polyurethane?

(a) Polyol

(b) Glycol

(c) Glycerol

(d) Glycerine

This question was addressed to me in an interview for job.

This key question is from Polycondensation in section Polymerization Industries of Chemical Technology

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Correct choice is (a) Polyol

The explanation is: Polyols are used as main raw material in the manufacture of polyurethane foams along with methyl di-phenyl diisocyanate and toluene diisocyanate.

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